Slipped Somerville Bowline

Personally I've never found any particular need for this -- I don't usually want to release a column tie while loaded -- but there was some previous discussion in which people were bemoaning not being able to untie a Somerville Bowline while under tension.

So if, for whatever reason, you want an ultra-quick-release column tie, here's a simple modification:

This has, I think, everything you could want in a quick-release knot -- when in the "locked" configuration, it would be very hard to release accidentally (and in fact you can tug on the bight all day long) -- but when you want to release it, it takes no force at all to unlock and then a single good yank not only releases the knot, but simultaneously unthreads the wrap passing under the cuff.

I'd say this is pretty inarguably easier to release than a Boola Boola, while also remaining more secure (if anything, it's even less likely to capsize than a normal Somerville Bowline).

Lochai also has a nice still shot of the (unlocked) finished knot, up here, that he did from my original textual description a couple weeks ago.